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Fix copydefine bug

--- a/cc1/cpp.c

+++ b/cc1/cpp.c

@@ -200,7 +200,8 @@

 static char *

 copydefine(char *s, char *args[], char *buff, int bufsiz, int nargs)

 {

-	unsigned ncopy, n;

+	unsigned ncopy;

+	int n;

 	size_t len;

 	char arroba[6], *par, *endp, **bp;

@@ -222,7 +223,7 @@

 			sprintf(arroba, "@%02d@", n);

 			break;

 		}

-		if (n == nargs)

+		if (n == nargs || nargs == -1)

 			par = s, ncopy = len;

 		else

 			par = arroba, ncopy = 4;